It depends on your motherboard, it is what contains your
bios settings-not XP.
If you have your motherboard manual, check it but if not,
look at your monitor when you first start your pc up, long
before XP gets loaded-Should be a black screen with the
info on your hard drives(master/Slave) settings etc.
It should say something like" to enter setup", or "to enter
settings" or "BIOS" press the "Delete" key or "F8" key etc.
Just reboot your pc and pay attention to the screen for the
info. May pass by fast and will be long before XP loads.